Create your own template

Templates are written using Jinja2 syntax. You can learn a lot from their excellent Template Designer Documentation

When making your own template, a great place to start from is one of Day One Export’s built-in templates.

The journal variable

The most important variable that the program passes to the template is named journal. This is a list of Entry objects, each of which represents a single journal entry.

Generally, a template will loop over elements of the journal variable, like this:

... Document header, title, etc ...

{% for entry in journal %}

    ... Code for a single entry ...

{% endfor %}

... End of document stuff, etc ...

Other variables

  • today: The current date.

The Entry object

An Entry object behaves a lot like a Python dictionary, which means you can access the data fields by name. For example, you use entry['Text'] to get the text of an entry.

Jinja uses double braces to insert a variable into the document, so to insert the entry’s text at a certain point in the document, you would include the following line in your template:

{{ entry['Text'] }}

Here are some keys that an entry may have:

  • Basic information:
    • Date
    • Text
    • Starred (boolean)
    • UUID
    • Activity: Description of motion activity, e.g. “Stationary”
    • Step Count: Number of steps from the motion sensor
    • Photo (the relative path of the corresponding photo, if it exists)
  • Information about the location:
    • Place Name (e.g. Boom Noodle)
    • Locality (e.g. Seattle)
    • Administrative Area (e.g. Washington)
    • Country (e.g. United States)
    • Longitude
    • Latitude
  • Information about the currently-playing music:
    • Album
    • Artist
    • Track
  • Information about weather:
    • Fahrenheit
    • Celsius
    • Description
    • IconName
    • Sunrise Date: The date and time of sunrise
    • Sunset Date: The date and time of sunset
    • Visibility KM
    • Relative Humidity
    • Pressure MB
    • Wind Bearing
    • Wind Chill Celsius
    • Wind Speed KPH
  • Information about the creation device:
    • Device Agent
    • Host Name
    • OS Agent
    • Software Agent

Jinja will just leave a blank space if you try to access a nonexistent key. So if an entry has no location information, {{ entry['Latitude'] }} will have no effect.

For more information, see the documentation for The Entry object.


You may want to combine the place information into a single string. You can do this with the place method.

With no arguments, inserts the place names in order from smallest to largest, separated by commas.

With a single integer argument, inserts the place names from smallest to largest, but only uses the n smallest places. For example, will always leave off the country.

If you want to get more specific, you can use a list as an argument. So[1, 3]) will put the Locality and Country, but leave off the Place Name and Administrative Area.

Finally, you can use an ignore keyword argument to ignore a specific string. For example,"United States") will print the full location information, but leave off the country if it is “United States”.

Don’t forget that to insert any of this into the document, you need to put it inside double braces.

More information is available in the documentation for The Entry object.


You may want to combine the weather into a single string. You can do this with the weather method.

The weather method takes one parameter to display the temperature as celcius or fahrenheit. For example,'F') will display the temperature in fahrenheit. The same can be done for celsius but with'C').

Don’t forget that to insert any of this into the document, you need to put it inside double braces.

More information is available in the documentation for The Entry object.

Jinja Filters

Jinja allows you to transform a variable before inserting it into the document, using a filter which is denoted by a |.

For example, {{ entry['Country'] | default("Unknown") }} pass the Country through the default filter, which in turn changes it to the string Unknown if the country does not exist.

Since the default filter can be particularly useful, I will point out that it may happen that Day One has defined the country to be the empty string, in which case, the default filter will let it remain empty. If you want the filter to be more aggressive (you probably do), you can use {{ entry['Country'] | default("Unknown", true) }}

There are several built-in Jinja filters available.

Format dates

This program defines a custom filter called format which formats dates.

For example:

{{ entry['Date'] | format('%Y-%m-%d %H:%M:%S %z') }}

The format filter also accepts an optional timezone argument, which overrides the native timezone of every entry. For example:

{{ entry['Date'] | format('%-I:%M %p %Z', tz='America/Los_Angeles') }}

displays the date in US Pacific time, regardless of the timezone where the entry was recorded.

Convert to Markdown

This program defines a custom filter called markdown which converts markdown text to html:

{{ entry['Text'] | markdown }}

Latex Templates

The standard Jinja template syntax clashes with many Latex control characters. If you create a Latex template, you will need to use different syntax.

In a Latex template, you use \CMD{...} instead of {% ... %} for block statements and \VAR{...} instead of {{ ... }} to insert variables. For example:

\CMD{for entry in journal}
\section{\VAR{entry['Date'] | format}}

You will also find the escape_tex filter useful, which escapes Latex control characters:

\VAR{entry['Text'] | escape_tex}

Note that the markdown filter outputs HTML so should not be used. There is currently no support for converting markdown input to formatted Latex output.

Latex templates must end with the .tex extension.

Inline images with base64 encoding

You can include the images inline with base64 encoding using a custom filter:

{{ entry['Photo'] | imgbase64 }}

The resulting entry looks like:

<img class="entry-photo" src="data:image/jpeg;base64,/9j/4AAQSkZJRgABA... ">

The base64 data can become quite large in size. If you have the Python imaging library installed, you can resize the images so that the resulting output remains sufficiently small (default maximum size is 400 pixels):

{{ entry['Photo'] | imgbase64(800) }}

This includes the image inline with a maxium size of 800 pixels.

More templating information

For more details on Jinja templates, see the Jinja template designer documentation.